1、 ETSI TS 126 430 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); LTE; Timed graphics (3GPP TS 26.430 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 430 V15.0.0 (2018-07)13GPP TS 26.430 version 15.0.0 Release 15Reference RTS/TSGS-0426430vf00 Keywords LTE,UMTS
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14、 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the pres
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16、 except when used in direct citation. ETSI ETSI TS 126 430 V15.0.0 (2018-07)33GPP TS 26.430 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 6g33.1 Def
17、initions 6g33.2 Abbreviations . 7g34 Overview and architecture 7g35 SVG-based Timed Graphics . 7g35.1 Introduction 7g35.2 Scene Description Restrictions . 7g35.3 Scene Commands . 8g35.4 Timed Graphics Media Unit Restrictions . 8g35.5 Timing model . 8g35.6 Processing Model . 8g35.7 Rendering Model 9g
18、35.8 Transport 9g35.9 Timed Graphics Profile 9g35.10 Timed Graphics Level 5 . 9g36 Simple Timed Graphics 10g36.1 Media definition . 10g36.1.1 Introduction. 10g36.1.2 Media component entities . 10g36.1.2.1 JPEG . 10g36.1.2.2 GIF and PNG 10g36.1.2.3 Timed Text 10g36.2 Layout definition 10g36.2.1 Intro
19、duction. 10g36.2.2 Rendering position and composition 10g36.3 Random access . 11g36.4 Timing and processing model 12g36.4.1 Timing model 12g36.4.2 Processing model 12g36.5 Transport and Storage 12g36.5.1 Overview 12g36.5.2 Storage in ISO base media file format files 12g36.5.2.1 Track Header. 12g36.5
20、.2.2 Media component specific configurations 13g36.5.2.2.1 Introduction . 13g36.5.2.2.2 Timed Text 13g36.5.2.2.3 JPEG, GIF and PNG 13g36.5.2.3 Timed Graphics ContentID Box . 13g36.5.2.4 Sample Entry Name and Format . 14g36.5.2.5 Sample Format 14g36.5.2.6 Sample Modifier Boxes . 14g36.5.2.6.1 Appeara
21、nce Delay . 14g36.5.2.6.2 HyperText 14g36.5.2.6.3 Box Over-ride . 14g36.5.2.6.4 Stereo Disparity . 14g3ETSI ETSI TS 126 430 V15.0.0 (2018-07)43GPP TS 26.430 version 15.0.0 Release 156.5.3 RTP payload format for Timed Graphics . 15g36.5.3.1 General 15g36.6 Registered Types 16g36.6.1 RTP Payload forma
22、t MIME Type . 16g36.6.2 Codecs Parameter for 3GP files 17g3Annex A (informative): Change history . 18g3History 19g3ETSI ETSI TS 126 430 V15.0.0 (2018-07)53GPP TS 26.430 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). T
23、he contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number a
24、s follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates
25、, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Timed graphics is a media type that enables advanced subtitle like services in parallel to video. It enables high quality text and graphics at a low cost. In low bit-rate video, t
26、he areas which are often perceived as the worst are subtitles and graphics or tables (encoded as part of the video). Encoding subtitles as timed text instead of as part of the video can increase the perceived quality of the video substantially. Timed Text 4 solves the problem of subtitles and when u
27、sed gives a perceptual quality much higher that encoding the text as part of the video stream. DIMS 5 allows the placement of vector graphics on top of video - but from an application perspective and requires DIMS to control the media. Timed Graphics works together with these abovementioned specific
28、ations, or independently, to enable better “video“ quality. ETSI ETSI TS 126 430 V15.0.0 (2018-07)63GPP TS 26.430 version 15.0.0 Release 151 Scope The present document defines a timed graphics media type which reuses components from existing media types. A transport system is defined as is a storage
29、 format. The specification is written in a forward-compatible way in order to allow additions of media components and functionality in future releases. It enhances the user experience by enabling graphics to be encoded as graphics (as opposed to video) and without requiring an umbrella system such a
30、s SMIL or DIMS. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific r
31、eference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present docu
32、ment. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 W3C Recommendation: “Scalable Vector Graphics (SVG) Tiny 1.2 Specification“. 3 3GPP TS 26.234: “Transparent end-to-end Packet-switched Streaming Service (PSS); Protocols and codecs“. 4 3GPP TS 26.245: “Transparent end-to-end Packet-swit
33、ched Streaming Service (PSS); Timed text format“. 5 3GPP TS 26.142: “Dynamic and Interactive Multimedia Scenes (DIMS“)“. 6 ITU-T Recommendation T.81 (1992) | ISO/IEC 10918-1:1993: “Information technology Digital compression and coding of continuous-tone still images Requirements and guidelines“. 7 C
34、ompuServe Incorporated: “GIF Graphics Interchange Format: A Standard defining a mechanism for the storage and transmission of raster-based graphics information“, Columbus, OH, USA, 1987. 8 CompuServe Incorporated: “Graphics Interchange Format: Version 89a“, Columbus, OH, USA, 1990. 9 IETF RFC 2083:
35、“PNG (Portable Networks Graphics) Specification Version 1.0“, Boutell T., et al., March 1997. 10 IETF RFC 4396: “RTP Payload Format for 3rd Generation Partnership Project (3GPP) Timed Text“, Rey J, Matsui Y, February 2006 11 ETSI EN 300 743 v1.4.1“Digital Video Broadcasting (DVB); Subtitling systems
36、“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 1. ETSI ETSI TS 126
37、430 V15.0.0 (2018-07)73GPP TS 26.430 version 15.0.0 Release 15Timed Graphics Entity: A byte aligned, network independent unit containing timed graphics data 3.2 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation def
38、ined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. DIMS Dynamic and Interactive Multimedia Scenes 4 Overview and architecture Timed graphics has two main components: The graphics description, i.e. the actual images, and the layout, i.e
39、. a coordinate system describing the placement of the images. Timed graphics is designed in as a media type. It can coexist with umbrella systems (e.g. DIMS or SMIL) just as other media types do, yet contains components from DIMS or other media types. Figure 1: Example of a Timed Graphics stream, in
40、 parallel to an audio and video stream. No “umbrella“ scene description is present. Timed graphics may be realized in one of two ways: SVG-based timed graphics or simple timed graphics mode. In the SVG-based timed graphics, the layout and timing are controlled by the SVG scene. The transport and sto
41、rage are inherited from DIMS. In the simple timed graphics mode, a binary representation format is defined to enable simple embedding of graphics elements. The transport over RTP and the storage in the 3GP file format are defined by this specification. 5 SVG-based Timed Graphics 5.1 Introduction SVG
42、-based Timed Graphics is defined as a profile of DIMS with certain restrictions and a layout mechanism for rendering timed graphics with external continuous media (i.e. video). Similarly to DIMS, SVG-based Timed Graphics consists of a multimedia scene. The multimedia scene is described using SVG Tin
43、y 1.2 2 and may consist of any combination of still pictures and animated graphics. In SVG-based Timed Graphics, continuous media such as audio and video are not allowed and shall be ignored by the receiver. The profile limitations are described in the following sections. 5.2 Scene Description Restr
44、ictions SVG Tiny 1.2 shall be used for the description of SVG-based Timed Graphics. The base scene description shall not contain any references to continuous media such as audio or video. The following restrictions to SVG Tiny 1.2 apply to the SVG scene of SVG-based Timed Graphics: - Timed Media Ele
45、ments: audio, video, and animation elements shall not be present in a timed graphics scene and should be ignored by the timed graphics client. - Interactivity: scripting and handling of events is not allowed and shall be ignored by the timed graphics client. Server Client Video stream Timed Graphics
46、 stream Audio/Other stream ETSI ETSI TS 126 430 V15.0.0 (2018-07)83GPP TS 26.430 version 15.0.0 Release 15Furthermore, SVG-based Timed Graphics scenes should not contain any elements or attributes from DIMS scene extensions. 5.3 Scene Commands Timed Graphics does not support scene commands. In a Tim
47、ed Graphics scene, DIMS scene commands should not be present and shall be ignored by a terminal that conforms to this specification. 5.4 Timed Graphics Media Unit Restrictions SVG-based Timed Graphics media units are DIMS media units that are restricted to complete SVG documents. The DIMS compressio
48、n method may be applied to Timed Graphics unit body. For Timed Graphics the Unit header fields shall be set as follows: S: is-Scene: shall be set to 1 and may be ignored by a Timed Graphics decoder. M: is-RAP: shall be set to 1 and may be ignored by a Timed Graphics decoder. I: is-redundant: shall b
49、e set to 0 and may be ignored by a Timed Graphics decoder. D: redundant-exit: shall be to 0 and may be ignored by a Timed Graphics decoder. P: priority shall be set to 1 and may be ignored by a Timed Graphics decoder. C: compression: indicates the compression applied; 0 indicates no compression (textual format); 1 indicates that the content is compressed using the encoding signalled in stream setup. X: reserved: shall be set to 0 and shall be ignored by the receiver 5.5 Timing model Timed Graphics consists of a sequence of SVG scenes
